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tftpd: the "is this address local" algorithm no longer works on Linux

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Linux no longer tries to match the local address with the remote one,
so address_is_local() fails.  Try instead to simply see if we can bind
to the explicit address.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
H. Peter Anvin 2011-12-08 21:48:06 -08:00
parent badf05140d
commit c6d2c36b1a
1 changed files with 23 additions and 16 deletions
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39
tftpd/recvfrom.c
View file

@ -51,52 +51,59 @@ struct in_pktinfo {
#endif
/*
* Check to see if this is a valid local address. If so, we should
* end up having the same local and remote address when trying to
* bind to it.
* Check to see if this is a valid local address, meaning that we can
* legally bind to it.
*/
static int address_is_local(const union sock_addr *addr)
{
union sock_addr sa;
union sock_addr sa1, sa2;
int sockfd = -1;
int e;
int rv = 0;
socklen_t addrlen;
memcpy(&sa1, addr, sizeof sa1);
/* Multicast or universal broadcast address? */
if (addr->sa.sa_family == AF_INET) {
if (ntohl(addr->si.sin_addr.s_addr) >= (224UL << 24))
if (sa1.sa.sa_family == AF_INET) {
if (ntohl(sa1.si.sin_addr.s_addr) >= (224UL << 24))
return 0;
sa1.si.sin_port = 0; /* Any port */
}
#ifdef HAVE_IPV6
else if (addr->sa.sa_family == AF_INET6) {
if (IN6_IS_ADDR_MULTICAST(&addr->s6.sin6_addr))
else if (sa1.sa.sa_family == AF_INET6) {
if (IN6_IS_ADDR_MULTICAST(&sa1.s6.sin6_addr))
return 0;
sa1.s6.sin6_port = 0; /* Any port */
}
#endif
else
return 0;
sockfd = socket(addr->sa.sa_family, SOCK_DGRAM, 0);
sockfd = socket(sa1.sa.sa_family, SOCK_DGRAM, 0);
if (sockfd < 0)
goto err;
if (connect(sockfd, &addr->sa, SOCKLEN(addr)))
if (bind(sockfd, &sa1.sa, SOCKLEN(&sa1)))
goto err;
addrlen = SOCKLEN(addr);
if (getsockname(sockfd, (struct sockaddr *)&sa, &addrlen))
if (getsockname(sockfd, (struct sockaddr *)&sa2, &addrlen))
goto err;
if (addr->sa.sa_family == AF_INET)
rv = sa.si.sin_addr.s_addr == addr->si.sin_addr.s_addr;
if (sa1.sa.sa_family != sa2.sa.sa_family)
goto err;
if (sa2.sa.sa_family == AF_INET)
rv = sa1.si.sin_addr.s_addr == sa2.si.sin_addr.s_addr;
#ifdef HAVE_IPV6
else if (addr->sa.sa_family == AF_INET6)
rv = IN6_ARE_ADDR_EQUAL(&sa.s6.sin6_addr, &addr->s6.sin6_addr);
else if (sa2.sa.sa_family == AF_INET6)
rv = IN6_ARE_ADDR_EQUAL(&sa1.s6.sin6_addr, &sa2.s6.sin6_addr);
#endif
else
rv = 0;
err:
err:
e = errno;
if (sockfd >= 0)